In this Note, thiophenolate-capped CdS nanocrystallites ( f-CdS ) , whose coverage was controlled, were prepared and isolated as powders,
Thiophenolate
-capped CdS nanocrystallites (f-CdS, mean diand their solubilities in N,N-dimethylformamide ( DMF ) were deterameter 3.5 nm, hexagonal) were prepared and isolated as powders mined by measuring absorption of the saturated DMF solutions of fby reacting thiophenol in the presence of triethylamine (TEA) CdS. The amount of the capping thiophenolate on the surface of fwith CdS nanocrystallites prepared from Cd 2/ and H 2 S in N,N-CdS could be controlled by changing the concentration of triethylamine dimethylformamide (DMF). The coverage of the capping thiophe-( TEA ) in the surface modification. The solubility of f-CdS was corre- nolate on the surface of CdS nanocrystallites can be controlled by lated with the coverage of the capping thiophenolate on the surface of varying the concentration of TEA in the preparation solution. The CdS nanocrystallites. dispersibility giving a clear DMF solution of CdS, i.e., the solubility
In order to prevent formation of byproducts, such as cadmium thiopheof f-CdS in DMF, is well correlated with the surface coverage of nolate [ Cd ( SC 6 H 5 ) 2 ] , the surface modification of CdS nanocrystallites thiophenolate, i.e., the solubility can be increased by increasing with thiophenolate was carried out after nucleation and growth of CdS nanocrystallites in DMF ( CdS-DMF, mean diameter 3.5 nm, hexagonal ) the coverage of thiophenolate.